[tip:x86/numa] x86: Unify cpu/apicid <-> NUMA node mapping between 32 and 64bit

From: tip-bot for Tejun Heo
Date: Fri Jan 28 2011 - 09:42:35 EST

Commit-ID: bbc9e2f452d9c4b166d1f9a78d941d80173312fe
Gitweb: http://git.kernel.org/tip/bbc9e2f452d9c4b166d1f9a78d941d80173312fe
Author: Tejun Heo <tj@xxxxxxxxxx>
AuthorDate: Sun, 23 Jan 2011 14:37:39 +0100
Committer: Ingo Molnar <mingo@xxxxxxx>
CommitDate: Fri, 28 Jan 2011 14:54:09 +0100

x86: Unify cpu/apicid <-> NUMA node mapping between 32 and 64bit

The mapping between cpu/apicid and node is done via
apicid_to_node[] on 64bit and apicid_2_node[] +
apic->x86_32_numa_cpu_node() on 32bit. This difference makes it
difficult to further unify 32 and 64bit NUMA handling.

This patch unifies it by replacing both apicid_to_node[] and
apicid_2_node[] with __apicid_to_node[] array, which is accessed
by two accessors - set_apicid_to_node() and numa_cpu_node(). On
64bit, numa_cpu_node() always consults __apicid_to_node[]
directly while 32bit goes through apic->numa_cpu_node() method
to allow apic implementations to override it.

srat_detect_node() for amd cpus contains workaround for broken
NUMA configuration which assumes relationship between APIC ID,
HT node ID and NUMA topology. Leave it to access
__apicid_to_node[] directly as mapping through CPU might result
in undesirable behavior change. The comment is reformatted and
updated to note the ugliness.

Signed-off-by: Tejun Heo <tj@xxxxxxxxxx>
Reviewed-by: Pekka Enberg <penberg@xxxxxxxxxx>
Cc: eric.dumazet@xxxxxxxxx
Cc: yinghai@xxxxxxxxxx
Cc: brgerst@xxxxxxxxx
Cc: gorcunov@xxxxxxxxx
Cc: shaohui.zheng@xxxxxxxxx
Cc: rientjes@xxxxxxxxxx
LKML-Reference: <1295789862-25482-14-git-send-email-tj@xxxxxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxx>
Cc: David Rientjes <rientjes@xxxxxxxxxx>
---
arch/x86/include/asm/mpspec.h | 1 -
arch/x86/include/asm/numa.h | 28 +++++++++++++++++++++++
arch/x86/include/asm/numa_32.h | 6 +++++
arch/x86/include/asm/numa_64.h | 5 +--
arch/x86/kernel/acpi/boot.c | 3 +-
arch/x86/kernel/apic/apic.c | 2 +-
arch/x86/kernel/cpu/amd.c | 47 +++++++++++++++++++++++++--------------
arch/x86/kernel/cpu/intel.c | 3 +-
arch/x86/kernel/smpboot.c | 6 +----
arch/x86/mm/amdtopology_64.c | 4 +-
arch/x86/mm/numa.c | 6 ++++-
arch/x86/mm/numa_32.c | 6 +++++
arch/x86/mm/numa_64.c | 26 +++++++++------------
arch/x86/mm/srat_32.c | 2 +-
arch/x86/mm/srat_64.c | 12 +++++-----
15 files changed, 101 insertions(+), 56 deletions(-)

diff --git a/arch/x86/include/asm/mpspec.h b/arch/x86/include/asm/mpspec.h
index edc2a45..9c7d95f 100644
--- a/arch/x86/include/asm/mpspec.h
+++ b/arch/x86/include/asm/mpspec.h
@@ -25,7 +25,6 @@ extern int pic_mode;
#define MAX_IRQ_SOURCES 256

extern unsigned int def_to_bigsmp;
-extern u8 apicid_2_node[];

#ifdef CONFIG_X86_NUMAQ
extern int mp_bus_id_to_node[MAX_MP_BUSSES];
diff --git a/arch/x86/include/asm/numa.h b/arch/x86/include/asm/numa.h
index 27da400..5e01c76 100644
--- a/arch/x86/include/asm/numa.h
+++ b/arch/x86/include/asm/numa.h
@@ -1,5 +1,33 @@
+#ifndef _ASM_X86_NUMA_H
+#define _ASM_X86_NUMA_H
+
+#include <asm/apicdef.h>
+
+#ifdef CONFIG_NUMA
+/*
+ * __apicid_to_node[] stores the raw mapping between physical apicid and
+ * node and is used to initialize cpu_to_node mapping.
+ *
+ * The mapping may be overridden by apic->numa_cpu_node() on 32bit and thus
+ * should be accessed by the accessors - set_apicid_to_node() and
+ * numa_cpu_node().
+ */
+extern s16 __apicid_to_node[MAX_LOCAL_APIC];
+
+static inline void set_apicid_to_node(int apicid, s16 node)
+{
+ __apicid_to_node[apicid] = node;
+}
+#else /* CONFIG_NUMA */
+static inline void set_apicid_to_node(int apicid, s16 node)
+{
+}
+#endif /* CONFIG_NUMA */
+
#ifdef CONFIG_X86_32
# include "numa_32.h"
#else
# include "numa_64.h"
#endif
+
+#endif /* _ASM_X86_NUMA_H */
diff --git a/arch/x86/include/asm/numa_32.h b/arch/x86/include/asm/numa_32.h
index b0ef2b4..cdf8043 100644
--- a/arch/x86/include/asm/numa_32.h
+++ b/arch/x86/include/asm/numa_32.h
@@ -6,6 +6,12 @@ extern int numa_off;
extern int pxm_to_nid(int pxm);
extern void numa_remove_cpu(int cpu);

+#ifdef CONFIG_NUMA
+extern int __cpuinit numa_cpu_node(int apicid);
+#else /* CONFIG_NUMA */
+static inline int numa_cpu_node(int cpu) { return NUMA_NO_NODE; }
+#endif /* CONFIG_NUMA */
+
#ifdef CONFIG_HIGHMEM
extern void set_highmem_pages_init(void);
#else
diff --git a/arch/x86/include/asm/numa_64.h b/arch/x86/include/asm/numa_64.h
index 0493be3..4982a9c 100644
--- a/arch/x86/include/asm/numa_64.h
+++ b/arch/x86/include/asm/numa_64.h
@@ -2,7 +2,6 @@
#define _ASM_X86_NUMA_64_H

#include <linux/nodemask.h>
-#include <asm/apicdef.h>

struct bootnode {
u64 start;
@@ -17,8 +16,6 @@ extern int compute_hash_shift(struct bootnode *nodes, int numblks,
extern void numa_init_array(void);
extern int numa_off;

-extern s16 apicid_to_node[MAX_LOCAL_APIC];
-
extern unsigned long numa_free_all_bootmem(void);
extern void setup_node_bootmem(int nodeid, unsigned long start,
unsigned long end);
@@ -32,6 +29,7 @@ extern void setup_node_bootmem(int nodeid, unsigned long start,
#define NODE_MIN_SIZE (4*1024*1024)

extern void __init init_cpu_to_node(void);
+extern int __cpuinit numa_cpu_node(int cpu);
extern void __cpuinit numa_set_node(int cpu, int node);
extern void __cpuinit numa_clear_node(int cpu);
extern void __cpuinit numa_add_cpu(int cpu);
@@ -44,6 +42,7 @@ void numa_emu_cmdline(char *);
#endif /* CONFIG_NUMA_EMU */
#else
static inline void init_cpu_to_node(void) { }
+static inline int numa_cpu_node(int cpu) { return NUMA_NO_NODE; }
static inline void numa_set_node(int cpu, int node) { }
static inline void numa_clear_node(int cpu) { }
static inline void numa_add_cpu(int cpu, int node) { }
diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c
index b3a7113..a7bca59 100644
--- a/arch/x86/kernel/acpi/boot.c
+++ b/arch/x86/kernel/acpi/boot.c
@@ -589,11 +589,10 @@ static void acpi_map_cpu2node(acpi_handle handle, int cpu, int physid)
nid = acpi_get_node(handle);
if (nid == -1 || !node_online(nid))
return;
+ set_apicid_to_node(physid, nid);
#ifdef CONFIG_X86_64
- apicid_to_node[physid] = nid;
numa_set_node(cpu, nid);
#else /* CONFIG_X86_32 */
- apicid_2_node[physid] = nid;
cpu_to_node_map[cpu] = nid;
#endif

diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c
index 0f4f3c1..4686ea5 100644
--- a/arch/x86/kernel/apic/apic.c
+++ b/arch/x86/kernel/apic/apic.c
@@ -2026,7 +2026,7 @@ int default_x86_32_numa_cpu_node(int cpu)
int apicid = early_per_cpu(x86_cpu_to_apicid, cpu);

if (apicid != BAD_APICID)
- return apicid_2_node[apicid];
+ return __apicid_to_node[apicid];
return NUMA_NO_NODE;
#else
return 0;
diff --git a/arch/x86/kernel/cpu/amd.c b/arch/x86/kernel/cpu/amd.c
index 7c7bedb..3cce8f2 100644
--- a/arch/x86/kernel/cpu/amd.c
+++ b/arch/x86/kernel/cpu/amd.c
@@ -234,17 +234,21 @@ static void __cpuinit init_amd_k7(struct cpuinfo_x86 *c)
#endif

#if defined(CONFIG_NUMA) && defined(CONFIG_X86_64)
+/*
+ * To workaround broken NUMA config. Read the comment in
+ * srat_detect_node().
+ */
static int __cpuinit nearby_node(int apicid)
{
int i, node;

for (i = apicid - 1; i >= 0; i--) {
- node = apicid_to_node[i];
+ node = __apicid_to_node[i];
if (node != NUMA_NO_NODE && node_online(node))
return node;
}
for (i = apicid + 1; i < MAX_LOCAL_APIC; i++) {
- node = apicid_to_node[i];
+ node = __apicid_to_node[i];
if (node != NUMA_NO_NODE && node_online(node))
return node;
}
@@ -339,26 +343,35 @@ static void __cpuinit srat_detect_node(struct cpuinfo_x86 *c)
int node;
unsigned apicid = c->apicid;

- node = per_cpu(cpu_llc_id, cpu);
+ node = numa_cpu_node(cpu);
+ if (node == NUMA_NO_NODE)
+ node = per_cpu(cpu_llc_id, cpu);

- if (apicid_to_node[apicid] != NUMA_NO_NODE)
- node = apicid_to_node[apicid];
if (!node_online(node)) {
- /* Two possibilities here:
- - The CPU is missing memory and no node was created.
- In that case try picking one from a nearby CPU
- - The APIC IDs differ from the HyperTransport node IDs
- which the K8 northbridge parsing fills in.
- Assume they are all increased by a constant offset,
- but in the same order as the HT nodeids.
- If that doesn't result in a usable node fall back to the
- path for the previous case. */
-
+ /*
+ * Two possibilities here:
+ *
+ * - The CPU is missing memory and no node was created. In
+ * that case try picking one from a nearby CPU.
+ *
+ * - The APIC IDs differ from the HyperTransport node IDs
+ * which the K8 northbridge parsing fills in. Assume
+ * they are all increased by a constant offset, but in
+ * the same order as the HT nodeids. If that doesn't
+ * result in a usable node fall back to the path for the
+ * previous case.
+ *
+ * This workaround operates directly on the mapping between
+ * APIC ID and NUMA node, assuming certain relationship
+ * between APIC ID, HT node ID and NUMA topology. As going
+ * through CPU mapping may alter the outcome, directly
+ * access __apicid_to_node[].
+ */
int ht_nodeid = c->initial_apicid;

if (ht_nodeid >= 0 &&
- apicid_to_node[ht_nodeid] != NUMA_NO_NODE)
- node = apicid_to_node[ht_nodeid];
+ __apicid_to_node[ht_nodeid] != NUMA_NO_NODE)
+ node = __apicid_to_node[ht_nodeid];
/* Pick a nearby node */
if (!node_online(node))
node = nearby_node(apicid);
diff --git a/arch/x86/kernel/cpu/intel.c b/arch/x86/kernel/cpu/intel.c
index d16c2c5..6052004 100644
--- a/arch/x86/kernel/cpu/intel.c
+++ b/arch/x86/kernel/cpu/intel.c
@@ -279,11 +279,10 @@ static void __cpuinit srat_detect_node(struct cpuinfo_x86 *c)
#if defined(CONFIG_NUMA) && defined(CONFIG_X86_64)
unsigned node;
int cpu = smp_processor_id();
- int apicid = cpu_has_apic ? hard_smp_processor_id() : c->apicid;

/* Don't do the funky fallback heuristics the AMD version employs
for now. */
- node = apicid_to_node[apicid];
+ node = numa_cpu_node(cpu);
if (node == NUMA_NO_NODE || !node_online(node)) {
/* reuse the value from init_cpu_to_node() */
node = cpu_to_node(cpu);
diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index 5319cdd..b7cfce5 100644
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -71,10 +71,6 @@
#include <asm/smpboot_hooks.h>
#include <asm/i8259.h>

-#ifdef CONFIG_X86_32
-u8 apicid_2_node[MAX_LOCAL_APIC];
-#endif
-
/* State of each CPU */
DEFINE_PER_CPU(int, cpu_state) = { 0 };

@@ -170,7 +166,7 @@ static void map_cpu_to_logical_apicid(void)
int cpu = smp_processor_id();
int node;

- node = apic->x86_32_numa_cpu_node(cpu);
+ node = numa_cpu_node(cpu);
if (!node_online(node))
node = first_online_node;

diff --git a/arch/x86/mm/amdtopology_64.c b/arch/x86/mm/amdtopology_64.c
index f21962c..c7fae38 100644
--- a/arch/x86/mm/amdtopology_64.c
+++ b/arch/x86/mm/amdtopology_64.c
@@ -247,7 +247,7 @@ void __init amd_fake_nodes(const struct bootnode *nodes, int nr_nodes)
__acpi_map_pxm_to_node(nid, i);
#endif
}
- memcpy(apicid_to_node, fake_apicid_to_node, sizeof(apicid_to_node));
+ memcpy(__apicid_to_node, fake_apicid_to_node, sizeof(__apicid_to_node));
}
#endif /* CONFIG_NUMA_EMU */

@@ -285,7 +285,7 @@ int __init amd_scan_nodes(void)
nodes[i].start >> PAGE_SHIFT,
nodes[i].end >> PAGE_SHIFT);
for (j = apicid_base; j < cores + apicid_base; j++)
- apicid_to_node[(i << bits) + j] = i;
+ set_apicid_to_node((i << bits) + j, i);
setup_node_bootmem(i, nodes[i].start, nodes[i].end);
}

diff --git a/arch/x86/mm/numa.c b/arch/x86/mm/numa.c
index ebf6d78..480b357 100644
--- a/arch/x86/mm/numa.c
+++ b/arch/x86/mm/numa.c
@@ -26,8 +26,12 @@ static __init int numa_setup(char *opt)
early_param("numa", numa_setup);

/*
- * Which logical CPUs are on which nodes
+ * apicid, cpu, node mappings
*/
+s16 __apicid_to_node[MAX_LOCAL_APIC] __cpuinitdata = {
+ [0 ... MAX_LOCAL_APIC-1] = NUMA_NO_NODE
+};
+
cpumask_var_t node_to_cpumask_map[MAX_NUMNODES];
EXPORT_SYMBOL(node_to_cpumask_map);

diff --git a/arch/x86/mm/numa_32.c b/arch/x86/mm/numa_32.c
index 84a3e4c..8d91d22 100644
--- a/arch/x86/mm/numa_32.c
+++ b/arch/x86/mm/numa_32.c
@@ -110,6 +110,12 @@ void set_pmd_pfn(unsigned long vaddr, unsigned long pfn, pgprot_t flags);

static unsigned long kva_start_pfn;
static unsigned long kva_pages;
+
+int __cpuinit numa_cpu_node(int cpu)
+{
+ return apic->x86_32_numa_cpu_node(cpu);
+}
+
/*
* FLAT - support for basic PC memory model with discontig enabled, essentially
* a single node with all available processors in it with a flat
diff --git a/arch/x86/mm/numa_64.c b/arch/x86/mm/numa_64.c
index 95ea155..1e1026f 100644
--- a/arch/x86/mm/numa_64.c
+++ b/arch/x86/mm/numa_64.c
@@ -26,10 +26,6 @@ EXPORT_SYMBOL(node_data);

struct memnode memnode;

-s16 apicid_to_node[MAX_LOCAL_APIC] __cpuinitdata = {
- [0 ... MAX_LOCAL_APIC-1] = NUMA_NO_NODE
-};
-
static unsigned long __initdata nodemap_addr;
static unsigned long __initdata nodemap_size;

@@ -716,12 +712,8 @@ void __init init_cpu_to_node(void)
BUG_ON(cpu_to_apicid == NULL);

for_each_possible_cpu(cpu) {
- int node;
- u16 apicid = cpu_to_apicid[cpu];
+ int node = numa_cpu_node(cpu);

- if (apicid == BAD_APICID)
- continue;
- node = apicid_to_node[apicid];
if (node == NUMA_NO_NODE)
continue;
if (!node_online(node))
@@ -731,6 +723,14 @@ void __init init_cpu_to_node(void)
}
#endif

+int __cpuinit numa_cpu_node(int cpu)
+{
+ int apicid = early_per_cpu(x86_cpu_to_apicid, cpu);
+
+ if (apicid != BAD_APICID)
+ return __apicid_to_node[apicid];
+ return NUMA_NO_NODE;
+}

void __cpuinit numa_set_node(int cpu, int node)
{
@@ -776,13 +776,9 @@ void __cpuinit numa_remove_cpu(int cpu)
void __cpuinit numa_add_cpu(int cpu)
{
unsigned long addr;
- u16 apicid;
- int physnid;
- int nid = NUMA_NO_NODE;
+ int physnid, nid;

- apicid = early_per_cpu(x86_cpu_to_apicid, cpu);
- if (apicid != BAD_APICID)
- nid = apicid_to_node[apicid];
+ nid = numa_cpu_node(cpu);
if (nid == NUMA_NO_NODE)
nid = early_cpu_to_node(cpu);
BUG_ON(nid == NUMA_NO_NODE || !node_online(nid));
diff --git a/arch/x86/mm/srat_32.c b/arch/x86/mm/srat_32.c
index 6027a48..48651c6 100644
--- a/arch/x86/mm/srat_32.c
+++ b/arch/x86/mm/srat_32.c
@@ -255,7 +255,7 @@ int __init get_memcfg_from_srat(void)
num_memory_chunks);

for (i = 0; i < MAX_LOCAL_APIC; i++)
- apicid_2_node[i] = pxm_to_node(apicid_to_pxm[i]);
+ set_apicid_to_node(i, pxm_to_node(apicid_to_pxm[i]));

for (j = 0; j < num_memory_chunks; j++){
struct node_memory_chunk_s * chunk = &node_memory_chunk[j];
diff --git a/arch/x86/mm/srat_64.c b/arch/x86/mm/srat_64.c
index 603d285..9a97261 100644
--- a/arch/x86/mm/srat_64.c
+++ b/arch/x86/mm/srat_64.c
@@ -79,7 +79,7 @@ static __init void bad_srat(void)
printk(KERN_ERR "SRAT: SRAT not used.\n");
acpi_numa = -1;
for (i = 0; i < MAX_LOCAL_APIC; i++)
- apicid_to_node[i] = NUMA_NO_NODE;
+ set_apicid_to_node(i, NUMA_NO_NODE);
for (i = 0; i < MAX_NUMNODES; i++) {
nodes[i].start = nodes[i].end = 0;
nodes_add[i].start = nodes_add[i].end = 0;
@@ -138,7 +138,7 @@ acpi_numa_x2apic_affinity_init(struct acpi_srat_x2apic_cpu_affinity *pa)
printk(KERN_INFO "SRAT: PXM %u -> APIC 0x%04x -> Node %u skipped apicid that is too big\n", pxm, apic_id, node);
return;
}
- apicid_to_node[apic_id] = node;
+ set_apicid_to_node(apic_id, node);
node_set(node, cpu_nodes_parsed);
acpi_numa = 1;
printk(KERN_INFO "SRAT: PXM %u -> APIC 0x%04x -> Node %u\n",
@@ -178,7 +178,7 @@ acpi_numa_processor_affinity_init(struct acpi_srat_cpu_affinity *pa)
return;
}

- apicid_to_node[apic_id] = node;
+ set_apicid_to_node(apic_id, node);
node_set(node, cpu_nodes_parsed);
acpi_numa = 1;
printk(KERN_INFO "SRAT: PXM %u -> APIC 0x%02x -> Node %u\n",
@@ -521,7 +521,7 @@ void __init acpi_fake_nodes(const struct bootnode *fake_nodes, int num_nodes)
* node, it must now point to the fake node ID.
*/
for (j = 0; j < MAX_LOCAL_APIC; j++)
- if (apicid_to_node[j] == nid &&
+ if (__apicid_to_node[j] == nid &&
fake_apicid_to_node[j] == NUMA_NO_NODE)
fake_apicid_to_node[j] = i;
}
@@ -532,13 +532,13 @@ void __init acpi_fake_nodes(const struct bootnode *fake_nodes, int num_nodes)
* value.
*/
for (i = 0; i < MAX_LOCAL_APIC; i++)
- if (apicid_to_node[i] != NUMA_NO_NODE &&
+ if (__apicid_to_node[i] != NUMA_NO_NODE &&
fake_apicid_to_node[i] == NUMA_NO_NODE)
fake_apicid_to_node[i] = 0;

for (i = 0; i < num_nodes; i++)
__acpi_map_pxm_to_node(fake_node_to_pxm_map[i], i);
- memcpy(apicid_to_node, fake_apicid_to_node, sizeof(apicid_to_node));
+ memcpy(__apicid_to_node, fake_apicid_to_node, sizeof(__apicid_to_node));

nodes_clear(nodes_parsed);
for (i = 0; i < num_nodes; i++)
--
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